On Thursday evening at my flyfishing club my professor told me that the color blue has been proven to excite the rainbow trout and other species. This was determined from placing a sensor into the optical lobe of the trout and presenting the color blue to the fish. I decided to test it out and tied a blue wolly bugger with red hackle and this is what i caught out of spring creek PA
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Please remember that I am only answering a question and will do so honestly. I do rather well with blue when fishing for trout here, however at this time of year on Spring Creek PA. the Brown trout are congregated around spawning hens and are very aggressive, meaning that they will take anything that comes near. With that knowledge in hand I wouldn't think that this particular trout made any decisions based on color. I fished Spring for 25 years very often and found the fish to be as stated, 'aggressive' during October - late December. I would hold more stock in the results if the catch were between 3 to 6 fish like this during the period of a days fishing during February - June than right now.

I do know it is for some fish to see the Colorado blue. I read somewhere once that walleye can only see the outline of a blue jig. So they are more likely to strike it. Its evidence is a 12 pound walleye my dad caught.

But trout and walleye have very different optical lobes I would guess.

Diver Dan is always touting blue and white Clousers for walleye! I swear by blue egg patterns for steelhead! Let's face it some colors have the edge with fish in general and others are are hit or miss. So many factors come into play when using colors such as water clarity , prey color , temperature , time of day and so on.
One of the finest trout men I have ever fished with went by the philosophy of size and shade. If the insect was dark you went dark(color didn't matter) if it was light you went light as long as the size was consistent with the insect you would catch fish. And this guy caught trout consistently when others were fumbling with hatch charts.

__________________
"I was born to fish" Lee Wulff
"There's more B.S. in fly fishing then there is in a Kansas feedlot." Lefty Kreh
" It ain't over till it's over." Yogi Berra
"Your not old,you've simply acquired a patina." Swirlchaser

I used blue chirono's the year before last and they were very effective. Same waters this year, and it was just another color. I had better luck with Zebras, red & white, and greens. I have no reason why either.
When fishing streamers or bugger style flies I wonder if blue, when wet is more like black. It's the last color to disappear in the water column and maybe blue is as close to black when wet that it is effective. There, black and browns with a spot of red on the fly are very effective in Utah, Idaho and Montana. Especially on bright days or nightime fishing.

Dont worry i did handle it carefully. Removed the fly as quickly as possible got a picture and placed it back into the water and monitored it for several min (10 or so) to make sure all was well he swam off on his own